Table 1 Antimicrobials used in the study and the tested concentration ranges

Nalidixic acid

NAL

16

-^c

32

2–128

Ciprofloxacin

CIP

0.06

0.12–0.5

1

0.12–16

Enrofloxacin

ENR

0.25

0.5–1

2

0.12–64

Neomycin

NEO

–

–

16

2–32

Gentamicin

GEN

4

8

16

1–64

Streptomycin

STR

32

–

64

2–128

Tetracycline

TET

4

8

16

2–128

Azithromycin

AZM

16

–

32

0.25–64

Amoxicillin/clavulanic acid

AMC

8/4

16/8

32/16

2/1–64/32

Cefoxitin

FOX

8

16

32

1–32

Ceftiofur

XNL

2

4

8

0.5–8

Ampicillin

AMP

8

16

32

2–32

Trimethoprim/sulfamethoxazole

SXT

2/38

–

4/76

0.12/2.38–4/76

Colistin

COL

2

–

4

2–32

Florfenicol

FFN

–

–

32

2–64

Chloramphenicol

CHL

8

16

32

2–64

Tigecycline

TIG

2

4

8

0.12–32

Fosfomycin

FOS

64

128

256

0.25–256